google some articles about bankroll management. maybe google chris ferguson bankrol management, he has a few guidelines to follow. when you stick to these rules it's almost impossible to get out of money
You missed out an important fact. In order to successfully use bankroll management first you need to be a long term winning player. And majority of people are losing at online (and live) poker.
If you're a long term losing player, there is no bankroll management that can save you from going to 0. It can only delay that process, so bankroll management for losing players is somewhat overrated in my opinion since they're going to end up busto anyway. Actually, going busto as soon as possible would be best for losing players since it should encourage them to take some actions, think deeper about their plays (and losses) and try to improve as quick as possible. So my general advice would be: Study and learn until you're able to constantly beat the game and then apply proper bankroll management if neccessary.
Bankroll management is designed for winning players, not for losing ones.
A little bit of topic but it's OK
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change instances of free poker into a link to https://www.cardschat.com/strategy/free-online-poker-game/